Draft-controlling installation for boiler-furnaces.



R. AGAR.

DRAFT CONTROLLING INSTALLATION FOR BOILER FURNACES. APPLICATION men SEPT. 1; 19M.

1,267,037. Patented May 21,1918.

Win

Witt Lewes:

A i 0 my Nrrnn sir-arts PATENT ent ies.

ROBERT AGAR, or SHORTLANDS, ENGLAND, ASSIGNOR r0 THE nnncoox & WILCQX COMPANY, or BAYONNE, NEW Jerse A oOnrOnarIoN on NEW JERSEY.

DRAFT-CONTROLLING INSTALLATION FOR, BOILER-FURNACES.

Specification of Letters Patent.

Application filed September 1, 1914. Serial No. 859,594.

To all whom it may concern:

Be it known that I, ROBERT AGAR, a subject of the King of Great Britain, residing at Shortlands, in the county of Kent, England, have invented certain new and useful Improvements in Draft-Controlling Installations for Boiler-Furnaces, of which the following is a specification.

This invention relates to draft controlling installations for furnaces adapted to operate under natural or induced draft; more particularly, the invention contemplates an installation applicable to a boiler furnace, the outlet-flue of which, is located at a considerable distance above the ground level.

With the object of inducing the draft of a boiler furnace it has already been proposed to fit a fan in a duct forming a bypass to the chimney-stack, through which duct all or part of the combustion gases may be caused to pass, depending on whether the draft is to be totally induced or merely assisted. It is evident, however, that such an arrangement would be unsuitable in the case where the outlet-flue of the boiler furnace is located at a considerable elevation above the ground as the length of the requisite ducts would become excessive, it being very undesirable to arrange the fan at an elevation.

In accordance with the present invention the necessity for providing long complicated ducts is dispensed with by dividing the lower portion of the chimneystack longitudinally into two compartments, one of which compartments communicates at its upper por tion with the furnace outlet-fiue and at its lower portion with the inlet-end of the fan,

and the other of which communicates withthe outlet-end of the fan and the chimneystack, controlling means being provided for diverting the gases through said compartments or causing them to pass directly from the furnace outlet-flue to the upper portion of the chimney-stack.

The invention is illustrated by way of example in the accompanying drawing, in which Figures 1 and 2 are elevations at right angles to each other showing the lower portion of a chimney stack and a fan connected thereto, 1 being broken away and showing certain parts in section. Fig. 3 is a plan of the invention.

Referring to the drawing, 1 denotes the chimney-stack, the lower portion 2 of which is divided by a partition 3 into two compartments a and 5. The upper and lower walls of the outlet-flue 6 from the furnace diverge toward the chimney-stack at the junction of the outlet flue with the latter, and form, in conjunction with angularly disposed walls connected to the partition 3, two branch ducts 7 and 8, the duct 8 communicating with the upper portion of the compartment 4 and the duct 7 communicating with the upper portion of the chimney-stack 1.

The inlet end 9 of a power-driven fan 10 is directly connected to the lower portion of the compartment l, while the outlet-end 11 of the fan is connected by means of a short duct 12 with the compartment 5, the upper end of which compartment 5 communicates directly with the chimney-stack 1. Within the branch ducts 7 and 8 are arranged dampers 13 and 14 respectively.

When natural draft is desired, the damper 1a is positioned to close the branch duct 8 while the damper 13 is manipulated to open the branch duct 7, so as to afford direct communication between the furnace outlet-flue 6 and the chimney-stack 1.

In order to induce the draft through the furnace, the fan 10 is set in operation and the branch duct 8 is opened while the duct 7 is closed. It will be seen that the fan will then draw the combustion gases from the outlet-flue 6 through the branch duct 8. downward through the compartment 4, discharging the gases through the duct 12 by way of the compartment 5 through which they flow in an upward direction, into the chimney-stack 1.

The arrangement above described can be adapted to any type of boiler in which the outlet-flue is located at an elevation above the ground level, such for example as the marine type orCross type of Babcock & Wilcox boilers, in which the outlet-flue is so located.

What I claim and desire to secure by Letters Patentof the United States is:-

In combination, a chimney stack having an inlet flue substantially above its base portion, a partition within the stack opposite the said inlet flue, said partition extending to a point substantially below the latter so as to divide the stack into compartments Patented May 21, HMS.

and forming with the stack two ducts, one- With said inlet flue and upwand: through of said ducts connecting said'inlet' 'flue with the other'oompartment." the stack above the partition and the other In testimony whereof I have hereunto connecting-4 saidinlet flue With one of said -'signed'my nametinsthe pnesenoe10f.twoisub; 5 compartment;-,- damp'eil'os" co1}t1rg11ing.u1'{s%)id scribing;witnesseec;.

ducts, and a an at the ase o t e stac eloW the inlet flue and supportedindepend--- ROBERT AGAR' ently of the stack and operative to force Witnesses: the' fiow of gasdownwardfrom thein1eo HENRY PELHAM SMITH, 10 flue through the compartment-. connected'. HENRY ALBERT .WELLING.

Copies of this:patent.may, be obtained for fivecents each, by addressing the .ICommissioner of Patents Washington, 0. 

